Method unlock

src/bthread/mutex.cpp:1155–1164

}

void FastPthreadMutex::unlock() {
    SUB_TLS_PTHREAD_LOCK_COUNT;
    MUTEX_RESET_OWNER_COMMON(_owner);
    auto whole = (butil::atomic<unsigned>*)&_futex;
    const unsigned prev = whole->exchange(0, butil::memory_order_release);
    // CAUTION: the mutex may be destroyed, check comments before butex_create
    if (prev != BTHREAD_MUTEX_LOCKED) {
        futex_wake_private(whole, 1);
    }
}

} // namespace internal
#endif // BTHREAD_USE_FAST_PTHREAD_MUTEX